Textron Bob-Cat, Operator'S Manual

Page: 27 / 119

25
HYDRO
MIDSIZE
TRACTION DRIVE HYDROSTAT ADJUSTMENTS The
following adjustments must be done in order.
STEP 1 - Set Neutral
Neutral is set at the factory. If it should require
adjustment, raise the wheels off the ground by setting
the machine on jackstands or blocks. Disconnect the
traction and speed control rods (R) at each pump end.
Loosen bolt (S) securing the neutral plate eccentric
shaft just enough to turn the shaft. Start the engine
and run at low speed. Turn eccentric shaft (T) to raise
or lower the point at which the follower bearing is held
in the center of the “V” until the wheels stop turning.
Tighten the eccentric shaft bolt. Increase the throttle
setting and check the adjustment. Readjust if neces-
sary. Shut the engine off before proceeding to steps 2
and 3.
STEP 3 - Adjust Traction Levers
Set neutral and adjust speed control rods as outlined
in steps 1 and 2. Set traction locks in the neutral
position. Grasp traction rod (A) and pull down on it to
take out any slack. The pump control arm has some
back and forth play. Adjust the swivel to the center of
the control arm play. Connect the swivel to the control
arm. Hook traction spring on the swivel and secure
with a hairpin cotter. NOTE: More reverse speed may
be gained by adjusting the swivel to the rear of the
control arm play. A minimum of 1/16" play is required
so the traction controls can be put in neutral without
the machine backing up.
Speed Control Lever Friction
The speed control levers are held where set by friction
pads. If the setting will not hold, tighten nuts (E) to
increase friction on speed control levers.
Center nut tightens tracking movement between
individual levers. End nuts tighten movement of both
levers for speed. Both speed control levers should
move together when one lever is moved. If not,
increase friction. Do not overtighten–this will make
tracking adjustment difficult.
ADJUSTMENTS
Step 2 - Adjust Speed Control Rods
First adjust neutral, as outlined in step 1. Set speed
control levers to neutral. Adjust swivels on lower ends
of speed control rods (A) so they just go into the slots
on the neutral plates. NOTE: If the speed control
levers do not have adequate tracking adjustment, the
swivel on one of the rods needs to be turned 1 turn.